SumatraPDF

Raised as a usability problem by 5 people on Hacker News over 5 years (2021–2025), in 4 threads.

People raised many different problems with SumatraPDF, but no single problem has yet been raised by 3 people in 3 different months and threads.

Unreviewed issues were grouped by machine: Claude Haiku labelled each comment as a usability complaint, named what it's about and summed up the problem in a line, and a small model grouped similar problems. Nobody has checked them by hand. Expect mistakes.

The newest 5 complaints

Can't figure out how to sign documents in the app2025-10-16
Can't show more than two pages side by side, making navigation back and forth cumbersome2023-10-24
Can't quickly find how to toggle dark mode or see annotations in a sidebar2022-05-31
Custom fonts unavailable for EPUB files after the 3.4 update, making it unusable2022-05-31
Window UI text becomes very low contrast in dark background mode2021-07-27